import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * @author: june
 * @date: 2023/8/18
 * @description: 测试专用
 **/

public class Demo {
    public List<List<Integer>> threeSum(int[] nums) {
        List<List<Integer>> res = new ArrayList<>();

        Arrays.sort(nums);

        for (int i = 0; i < nums.length; i++) {
            if (nums[i] > 0) {
                return res;
            }

            if (i > 0 && nums[i] == nums[i - 1]) {
                continue;
            }

            int left = i + 1;
            int right = nums.length - 1;

            while (left < right) {
                if (nums[i] + nums[left] + nums[right] < 0) {
                    left++;
                } else if (nums[i] + nums[left] + nums[right] > 0) {
                    right--;
                } else {
                    res.add(Arrays.asList(nums[i], nums[left], nums[right]));
                    left++;
                    right--;
                    while (left < right && nums[left] == nums[left - 1]) {
                        left++;
                    }
                    while (left < right && nums[right] == nums[right + 1]) {
                        right--;
                    }
                }
            }
        }
        return res;
    }

    public static void main(String[] args) {
        Demo demo = new Demo();
        int[] nums = {-1, 0, 1, 2, -1, -4};
        List<List<Integer>> lists = demo.threeSum(nums);
        System.out.println(lists);
    }

}
